Yes, katanas typically have a hand guard, which is known as a tsuba in Japanese. The tsuba serves as a protective guard between the blade and the wielder's hand. It is usually circular or oval in shape and is located between the blade and the hilt (tsuka) of the sword.

The primary function of the tsuba is to prevent an opponent's weapon from sliding down the blade and reaching the hand of the wielder during combat. It also helps in maintaining a firm grip on the sword and provides balance. Additionally, the tsuba can have decorative elements and may reflect the personal style or clan affiliation of the sword's owner.

The design and materials used for tsuba can vary greatly, ranging from simple and practical to highly ornate and artistic. Traditional tsuba were often made of metal, such as iron or bronze, but there are also examples made from other materials like wood, horn, or even precious metals for ceremonial or display purposes.

Overall, the tsuba is an integral component of the katana, contributing to both its functionality and aesthetic appeal.